The Jenkins core release automation project has been delivering Jenkins weekly releases since Jenkins 2.232, April 16, 2020. The Linux repositories that deliver the weekly release were updated with new GPG keys with the release of Jenkins 2.232.
Beginning with Jenkins LTS release 2.235.3, stable repositories will be signed with the same GPG keys that sign the weekly repositories. Administrators of Linux systems must install the new signing keys on their Linux servers before installing Jenkins 2.235.3.
Update Debian compatible operating systems (Debian, Ubuntu, Linux Mint Debian Edition, etc.) with the command:
# wget -qO - https://pkg.jenkins.io/debian-stable/jenkins.io.key | apt-key add -
Update Red Hat compatible operating systems (Red Hat Enterprise Linux, CentOS, Fedora, Oracle Linux, Scientific Linux, etc.) with the command:
# rpm --import https://pkg.jenkins.io/redhat-stable/jenkins.io.key
Updates will be blocked by the operating system package manager (apt, yum, dnf) on operating systems that have not installed the new repository signing key. Sample messages from the operating system may look like:
Reading package lists... Done W: GPG error: https://pkg.jenkins.io/debian-stable binary/ Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY FCEF32E745F2C3D5 E: The repository 'https://pkg.jenkins.io/debian-stable binary/ Release' is not signed. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details.
Downloading packages: warning: /var/cache/yum/x86_64/7/jenkins/packages/jenkins-2.235.3-1.1.noarch.rpm: Header V4 RSA/SHA512 Signature, key ID 45f2c3d5: NOKEY Public key for jenkins-2.235.3-1.1.noarch.rpm is not installed
The original repository GPG signing key is owned by Kohsuke Kawaguchi. Rather than require that Kohsuke disclose his personal GPG signing key, the core release automation project has used a new repository signing key. The updated GPG repository signing key is used in the weekly repositories and the stable repositories.
Operating systems that use Debian package management (apt) and operating systems that use Red Hat package management (yum and dnf) need the new repository signing key.
Other operating systems like Windows, macOS, FreeBSD, OpenBSD, Solaris, and OpenIndiana are not affected.